- Add TravelDayOverride model for storing user-customized travel day positions
- Add TravelOverrideService for CloudKit CRUD operations on travel overrides
- Add CKTravelDayOverride CloudKit model wrapper
- Refactor itinerarySections to validate travel day bounds (must be after last game in departure city)
- Travel segments can now be dragged to different days within valid range
- Persist travel day overrides to CloudKit for cross-device sync
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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